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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef CONDITION_H
#define CONDITION_H
#include <pthread.h>
struct condition {
pthread_mutex_t mutex;
pthread_cond_t cond;
};
void cond_init(struct condition *cond);
/**
* The thread which shall be notified by this object must call this
* function before any cond_wait() invocation. It locks the mutex.
*/
void cond_enter(struct condition *cond);
/**
* Neutralize cond_leave().
*/
void cond_leave(struct condition *cond);
/**
* Wait for a conditio. Return immediately if we have already
* been notified since we last returned from cond_wait().
*/
void cond_wait(struct condition *cond);
/**
* Wait for a condition with timeout
*
* @param sec number of seconds to wait for (subject to change)
*
* @return ETIMEDOUT if timed out, 0 if notification was received
*/
int cond_timedwait(struct condition *cond, const long sec);
/**
* Notify the thread there is a waiter. This function never blocks.
*
* @return EBUSY if it was unable to lock the mutex, 0 on success
*/
int cond_signal_async(struct condition *cond);
/**
* Notify the thread synchronously, i.e. wait until it can deliver
* the notification.
*/
void cond_signal_sync(struct condition *cond);
/**
* cond_destroy - destroy the cond and internal structures
*/
void cond_destroy(struct condition *cond);
#endif /* CONDITION_H */
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